You can't really complain at these type of signings. If he doesn't amount to much no great loss, but there's always the chance you can strike gold.
Celtic paying 900k for an unknown Kenyan and just sold him for 12 million a couple of seasons later an example.
Moyes took a punt for 60k on an unknown Irishman which has also paid handsome dividends.
Gueye on the flip side hasn't come off, but at 1 million no damage done and we'd still probably recoup that back.
I've no problem with these low risk signings.